20941121 has 4 divisors (see below), whose sum is σ = 20953044. Its totient is φ = 20929200.

The previous prime is 20941091. The next prime is 20941163. The reversal of 20941121 is 12114902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12114902 = 2 ⋅6057451.

It can be written as a sum of positive squares in 2 ways, for example, as 15484225 + 5456896 = 3935^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20941121 - 2²² = 16746817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20941093 and 20941102.

It is not an unprimeable number, because it can be changed into a prime (20941171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2750 + ... + 7031.

It is an arithmetic number, because the mean of its divisors is an integer number (5238261).

Almost surely, 2^20941121 is an apocalyptic number.

It is an amenable number.

20941121 is a deficient number, since it is larger than the sum of its proper divisors (11923).

20941121 is an equidigital number, since it uses as much as digits as its factorization.

20941121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11922.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20941121 is about 4576.1469600527. The cubic root of 20941121 is about 275.6343307327.

The spelling of 20941121 in words is "twenty million, nine hundred forty-one thousand, one hundred twenty-one".